Strategy

Cat Combos: All combos are good if they give you more damage>money>unit speed

Recommended Power-Ups: Rich Cat and Sniper the Cat

Strategy: Start with anything else but Bahamut and turn Sniper off. When the first Assassin Bear comes, make sure that your line is not blocking it so Sniper Cat can take that bear down. Then continue sending those high damage cats again, also leave Sniper on so it can recharge for next bear. At this point you should have killed Dober, now hope that your Bahamut is still alive so you can finish the base in time.